Fix: Clarify Cache type configuration [4.2.0]

[wso2-engineering-bot]

This PR was automatically generated by Claude AI.

• Issue: It is unclear the Cache type [Finder] configuration #1670
• Type: Documentation
• Summary: Clarified the relationship between cache types (Finder/Collector) and the collector parameter in XML configuration
• Style Scope Verification: Microsoft Style Guidelines have been applied ONLY to newly added content without modifying existing content style unless specifically requested.
• Verification: mkdocs build executed successfully with expected warnings unrelated to changes